Long requested crochet tutorial is finally up!
If you want a printed pattern, I’d suggest Sarah Arnold’s Divine Hat however, there are no instructions for the 2-color version. Be aware that there are MANY versions of this design out there under various names like “crochet spiral beanie” or “easy seashell hat” and more. I have no idea who to give original credit to so I’m recommending Sarah’s pattern because that’s the one I used.
In the video, I reference 2 files that can be found here: my usual hat-sizing-chart and one where I made Candy Swirl Hat Notes suggesting yarn and hook sizes. (Please remember these are only suggestions to help you find a starting point for sizing this difficult-to-size hat!)